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It is a good idea to tack on .convert() to any calls to pygame.image.load to ensure your images will be in the fastest format for the display. The exception is when your image has an alpha channel, because convert can discard it. Fortunately Pygame provides a convert_alpha method, which will convert the surface to a fast format but preserve any alpha information in the image. We have used both methods in the previous chapter; the following two lines are taken from Listing 3-1: background = pygame.image.load(background_image_filename).convert() mouse_cursor = pygame.image.load(mouse_image_filename).convert_alpha() The background is just a solid rectangle so we use convert. However, the mouse cursor has irregular edges and needs alpha information, so we call convert_alpha. Both convert and convert_alpha can take another surface as a parameter. If a surface is supplied, the surface will be converted to match the other surface.

BusyBox s init implementation is a common replacement for the SysV init. The BusyBox init program works much like the original, with the following exceptions

There are no runlevels: The only runlevel supported is 0. If a runlevel is supplied, it s ignored. Only the following actions are supported: sysinit, respawn, becausekfirst, wait, once, restart, ctrlaltdel, and shutdown. The action askfirst provides a prompt asking that a key be pressed before running the command; it then works like respawn with respect to restarting the task. The first field isn t an identifier: This field is used to indicate what TTY device to use when running the program. This value is appended to /dev/ when supplied, so the following lines run login processes on ttyS0 and ttyS1: ttyS0::respawn:/sbin/getty -L ttyS0 9600 vt100 ttyS1::respawn:/sbin/getty -L ttyS1 9600 vt100

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To listen to music on your Xbox 360 streamed from the Music shared folder, follow these steps: 1. Select Music on the Media blade. 2. On the Music menu, select Computer, as shown in Figure 10-3.

Pygame will often require you to give it a rectangle to define what part of the screen should be affected by a function call For instance, you can restrict Pygame to drawing on a rectangular area of the screen by setting the clipping rectangle (covered in the next section) You can define a rectangle using a tuple that contains four values: the x and y coordinate of the top-left corner followed by the width and height of the rectangle Alternatively, you can give the x and y coordinate as a single tuple followed by the width and height as another tuple The following two lines define the rectangle with the same dimensions: my_rect1 = (100, 100, 200, 150) my_rect2 = ((100, 100), (200, 150)) You can use whichever method is most convenient at the time.

If no /etc/inittab file is found, BusyBox uses this as a default: ::sysinit:/etc/init.d/rcS ::askfirst:/bin/sh ::ctrlaltdel:/sbin/reboot ::shutdown:/sbin/swapoff -a ::shutdown:/bin/umount -a -r ::restart:/sbin/init

Figure 10-3. Select Computer on the Music menu. 3. If your Xbox 360 prompts you to download and install media sharing software, as shown in Figure 10-4, just click Yes, Continue, because the required software is built into Windows Home Server, so you don t need to do anything else.

The default init file is usually good enough to quickly get a system running. A production system needs to define something different.

For instance, you may already have the coordinate and size stored as a tuple, so it would be easier to use the second method In addition to defining rectangles, Pygame has a Rect class that stores the same information as a rectangle tuple but contains a number of convenient methods to work with them Rect objects are used so often that they are included in pygamelocals so if you have from pygamelocals import * at the top of your script, you don t need to precede them with a module name To construct a Rect object, you use the same parameters as a rectangle tuple.

The program run for init can be anything that the system can execute: a binary, shell script, Perl script the only requirement is that it can be run. Like any other init process, when this program stops, the kernel panics and halts. That means the program must be coded so that it works something like the respawn command in init. The typical strategy for implementing this sort of protection is to spawn the program such that the system runs in a separate process and restarts when it fails.

Figure 10-4. Continue past the request to download Windows Media Connect. 4. You then see the Searching for Windows-based PCs message, as shown in Figure 10-5. After the Xbox 360 searches your home network for computers running the Windows Media Connect software, you are presented with a list of available computers, as shown in Figure 10-6. Your Windows Home Server should be listed. Select it from the list.

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